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common sense; good sense; common knowledge; general knowledge; common practice; accepted practice; social etiquette
そんなの常識じゃないですか。
Isn't that common sense?
電車の中では静かにするのが常識だ。
It's common sense to keep quiet on the train.
常識を疑うことも時には大切です。
It's also important to question common sense.